1253 / 1778
• In
IMRT
plans often the
most exposed volume
is not a relating agglomeration (cluster),
but in the organ
takes place sporadically
•
bladder
: not the same volume receives the highest dose in IMRT than in 4F-box treatments
•
rectum
: sometimes the close same division
•
sigmoid
: always the close same
IMRT
4F-box
BT
OAR
IMRT
4F
p
bladder
-1.6
1.4
0.03
rectum
2.9
2.6
>0.05
sigmoid
5.2
0.0
0.0001
The dose of
BT
in the most exposed 2 ccm in
IMRT
and
4F
plans
[D
EBRT-B
(% - PD)
So it is deserving to compute for OARs i BT dose planning in this way:
they
had received approximately the PD of the external beam treatment.
Compare the
Position
of the Most Exposed
D
xcc
Areas
in
EBRT
and
BT
Provided by G. Fröhlich, Budapest, Hungary
Target:
D90 (total) = PD
(EBRT)
+
D90(BT)
OAR: D
2cm³
(total) = PD
(EBRT)
+ D
2cm3
(BT)